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Electron energy and geometry parameters of InGaAs/GaAs quantum rings: an interpretation of C-V data

Published online by Cambridge University Press:  12 April 2012

I. Filikhin ,
V. M. Suslov ,
M. Wu ,
M. Dukic ,
H. Melikyan  and
B. Vlahovic
I. Filikhin
Affiliation:
North Carolina Central University, Durham, NC 27707, USA
V. M. Suslov
Affiliation:
North Carolina Central University, Durham, NC 27707, USA
M. Wu
Affiliation:
North Carolina Central University, Durham, NC 27707, USA
M. Dukic
Affiliation:
North Carolina Central University, Durham, NC 27707, USA
H. Melikyan
Affiliation:
North Carolina Central University, Durham, NC 27707, USA
B. Vlahovic
Affiliation:
North Carolina Central University, Durham, NC 27707, USA
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Abstract

We investigate the electronic properties of InAs/GaAs quantum rings (QRs) in a magnetic field using an original effective potential model based on a single band kp-approximation with an energy dependent effective mass. We used two sets of geometrical parameters for the selfassembled QRs. The first is the experimentally proposed geometry; the second follows from the oscillator model due to the relation between the model parameters and the real sizes of the quantum objects. The energy of an electron in a magnetic field, calculated for each of the geometries, is compared with C-V experimental data. We show that the results of the calculation obtained for the second geometry fit the experimental data rather well. Interpretation of the recent C-V data given by W. Lei et al. (Appl. Phys. Lett. 96 (2010) 033111) on the basis of the oscillator model is discussed.

Keywords

nanostructureself-assemblyelectronic structure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1411: Symposium EE – Self Organization and Nanoscale Pattern Formation , 2012 , mrsf11-1411-ee09-13
Copyright
Copyright © Materials Research Society 2012

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References

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